Guide on adding a new model, animation, and creature to HoMMV

I'm not "continuing to work on modding"; I'm just sharing information I learned in my spare time. Maybe it will be useful to someone, and they will create mods.

And now, some new information. I used Asset Studio to explore the M&M Dynasty game that xuxo mentioned. You can extract models, textures, skeletons, and animations from this game. 
It uses some models from the 6th game and some from the 7th. But they are more optimized. For example, the pikeman in Dynasty consists of 3.8k polygons, while in the 6th game, the same pikeman has about six to seven thousand polygons. Overall, this is good. There is no visual difference, but the load is almost twice as low. But sometimes, certain individual elements, like shoulder pads, look a bit angular, and it's still better to use the models from the 6th game for them.
Another key feature of the models from Dynasty is the new animation for them. Sometimes it looks more interesting than the original, sometimes worse, but it's still great for variety. The skeletons of the models from Dynasty and from the 6th/7th games are very similar, but unfortunately, they are not compatible by default. However, if you tinker with them a bit, you can adapt one skeleton to another so that you can use both the animations from the 6th/7th games and the animations from Dynasty for the model.

In addition, you can extract demon models from the 6th game with complete sets of animations from Dynasty. 

And one more thing. In Dynasty, there are unique models for heroes. Crag Hack, Darkstorm, and others have been found. As far as I understand, there is already someone from the Ashan heroes from the 5th game. I haven't figured out exactly who. In a future update with necromancers, they will add a model of Kaspar.